Which existing roofs can accept this coating?
Suitability depends on the selected silicone product, the existing membrane or coating, adhesion, moisture and the condition of details. A roof with wet insulation, unstable cover board, open seams or deteriorated flashing needs correction before an overcoat can be considered. We identify previous materials where records and inspection support them, and explain when an adhesion test or opening is needed. Confirm that the selected silicone product is compatible with the existing membrane or coating, including any prior repair materials. Where foam is the substrate, compare the coating choice with the complete SPF roof assembly and its protective-layer instructions.
Manufacturer documents list approved substrates and preparation for each individual product. For GAF High Solids Silicone Roof Coating, confirm the approved substrate types, preparation and application limits in its current product instructions. The proposal should say which coating and primer, if required, will be used and which repairs precede application. If condition does not support a coating, compare roof repair or replacement instead of sealing over a questionable layer.